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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eeaff5f4cf93829c219b9ce3101e0fbda55b2c163e99cf08f5b16ddf5103851' 
  AND token = 'PPQlBqn8kkI5EGL2QaLSLkHpOBKDKjNWFcS2e6W9w5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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