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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662ec40eb7ed4f09e9f669ccf19bf6d6c2a8be516b3834dc79d9cf06916a106e' 
  AND token = 'wh4vee+RFAKtiF4E586+Cs2g9CVmWjsHa9CoFiegL/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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