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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da33fab071bdff6a1d6de40de5207e564f55074c5f8aaaa98381e4b0cc51f6c' 
  AND token = 'UQq+wk4VURtfyPWiPhPAppsHyd9KUtwZS0hbN5tQkeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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