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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10024417bc971b368c0de97f1af11332a65a023b2619c2b3cd0463c92ed1d02d' 
  AND token = 'e2fUMC/tOIumrYbCdlFUTXhwUBtvrz/0qD5Xgf7+Ehc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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