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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52a60ed1d6b4555ea9f5fb0f679dfe11471826dc89fb5efd7e76599712b33cb' 
  AND token = 'zfmYXR5K5KKA5MB9mkgQXrahcrv1gd93dgXdIw/DbxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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