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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9dc0628f52bee7ad23b7d91b7e709c99ad8d15373dddbe5218d9a45d1a7f17' 
  AND token = 'YPE2MXXraOd3IWDbPG6zQkkZTQUApX5MBQuoKe8bCgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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