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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5715adc8beace8bde6bb5daaf38371a5f284b7a28e6c64c86bad5abc3241e92d' 
  AND token = '3AcLCIRVMELB9vYG0N37eXYwpO4RYGIl1dmgrRa7mII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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