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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76df81326740ebe4e4900c8312413e91758be8fff680e45ed2081ee65729df54' 
  AND token = 'pa34xCR2Xa5+juqP+e6BmHgQTfErP/Qh2JnHu4QQOv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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