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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b6d3f051f5ff4855ac722e800cb7c4da70609223c6eb903911d1cd2b6d4f65' 
  AND token = 'ZX0LRU6zMXFAbN6c0RFg4hibJ1DceRiFgWD+JKMB16A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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