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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814add258d9d09574ac9ff58381d1d517ceb6e188242a32e6b5ae37c970c6a1f' 
  AND token = '75QA2/+cRiJyKR5/RNByUYfXxL+dnla7Etk5tH+qEbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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