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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7778dd71e8d390c968ed760b51114f27b80e06a65e41cca056cee8ee6522c04' 
  AND token = 'oM0l4Vu98pBQ5AhbVw+kSlQyX9ZdNzmw3ld94PiOGO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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