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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5a79cb6ec30684b19f360314e4cb751bb85678121468e2c9a5856d8afe5afd' 
  AND token = 'rgvfydZH0XanGDlFc2o34JBLJexb7e0wkDhiwTxYjSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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