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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbfe9d95cacc5a8a824a7435525585e88e3413e4fcc28c5bccc71145cf6cbacf' 
  AND token = 'xeXMNgKV+0KVpo6Pa0mF3M9zupoGoDn7C5OgZdS7aBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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