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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc48218e8f2a01d20ba9db1f6ad56175fd8ef077fa57215c210b79d2c26eeb9c' 
  AND token = 'gP2YZqridPFmjLKIv5ejM3nIWJaXjSSPqQraFKmjAEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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