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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b9d1fb4c5ee3ccafdf18b966a86305cb7ef0a7122fd18321f1470f94e6c9f4' 
  AND token = '00kWylBydDkYyiUjmjLf6+Kph/8C11YAzPuw3KJytIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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