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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b3339a185b41980ee5d9fac54c9cf1eac20eba8e99f7006ec4ba7c58802d41f' 
  AND token = 'l+rIMUCkbiQcMmEk/Gttp72t16FMM5+KVMS79GFpatg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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