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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8938e98dacd4f474a7ea907ea78468375a55fde4dbee71e54549b897b3caea97' 
  AND token = 'u1ljt7RjwZFRLMK/vJLvGcJhyl/86HdbAiJDf5tZaL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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