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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4bfe701ac480d368bfb442a4cf8d7a55e4bdec771fcb663bfafe27ed34d2a8a' 
  AND token = '0phYXgLt/FI6bvfns+FQeT/SjrnjIW1yn8CoOt9AcDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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