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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23ad68e23c970c5e15a4cf4c0d4fa83ae15ee5588da2a9509de078514f27b7e' 
  AND token = 'O3B6woJIC2Ok8bT5WiaaGlvKlWjO5JEOPFkSLRrdd2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}