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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e24f1a680a05929d763838a6bb198434f7d01b1ae8d9f93737d9ab6b6a6d074' 
  AND token = '5eqgY6ftRABOwPYw/6zL/dIy9Dn23kfVjpV4qOQLtoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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