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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71f1433ca7efb738eefc3ad0e11027739bdb20ec8e407b8a20d11d56de87b72' 
  AND token = 'hJNrev4jkjbBVU12D9Ck+Gxp3isgI/IRDu/yvFWd3pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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