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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee498094dd554b2c8295c9ddc00888d9d021afa863a08f9366986e73247b602' 
  AND token = 'Smc0zxVT0bWBiKtICH04l9ccGDUQ3x+qy5P2X0W+12g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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