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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1ebf2f542f45bb92a9276bbc24bcf36f92fec4c9625e9e522187604d1b0b4e' 
  AND token = 'OHRgAPNH12EvPyH8iJlBlglKhCqQdLO03TBDv8+zFXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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