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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271db0a995e168328c7aa659fca9b653a18d26c9647a9e6e2948bf521fc5e09c' 
  AND token = '3L0JWf4aHZ29uICwqAv7aJ9BtGfI9I2xn2Gys6XikKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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