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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbf5a2cf223ce395a0d03dd588cd4d0add81466f276eaa677d34cce79afc548' 
  AND token = 'aMq3zUFkBvkfh8wg74opjFzIWNLwlhR8rVUUJ6ODOTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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