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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd178aa762b04e96e45bf6bf476435743b9a37d4ede0d9cb63e30c5f70bab5a05' 
  AND token = 'sssgY8KvWn9ma21gAmDZExndjp7RZ1Oi/pjq6OQ/c7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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