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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e76e7e77f9718b1cebdc84d9e82a4b1069328fcbb081c1feb5fde90aea62f9' 
  AND token = 'Bnxdg4XbYpE5zSQJz9ttynndqW2msS2X9Hpr4f6XyGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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