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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b59f674f7610b5e42008bdddfa9137db3f5c6c75cddf54467b13fd44a6e09cf6' 
  AND token = 'Ufmh/JYJ8/IYj578Jt8Sp5TxnTQJ6aw/55BOF7LkJTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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