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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ecc1385cf5b6823eaedbaf0f7e7b46cf4acbf09d4af16c89de0955452a3f029' 
  AND token = '2+FchRTS4GUnKttK3qEMzOcf8DE4iWSJSmGHDpSoRGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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