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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26bd18d472f35d48b0ed9c2aa1aff892b5f3eeb8de6573bd4d088eda2a1be6f' 
  AND token = 'l1Ag/xloHRZE6MVC2GYjrRkCS7LuN+cEtFGBznSqNMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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