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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3abd5fbf5b8ea8c7751fa74a233baba7e857707df0c4dfb5ef1bb7104128dc' 
  AND token = 'ojYyRGyAx5ldxMzc9hQR7mkLVjAAStxhMBTmdPx+lUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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