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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c532f9f2ce63bcd20731d6318a3616d8cf5e94ff5eed65dc97792f6d82f0b2b' 
  AND token = '+u0wkpvJ1o1UwR7ZJdEZvE4ZbCX0y6YIfS0ie3L/L1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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