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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9b7f8fca9d6ca4cc3d0afc92c7bfa1effc385384f1a119a5490d9e6886671b' 
  AND token = 'mlQDozDCD5myeDTXgqa5frXJdB7xTqu9Z02bIhyYguM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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