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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '762f67c5802c6c43626767bd646888dfb31dd5c71b7170143db57aa01f5afc58' 
  AND token = 'ImkuX3sDnHsyLWFwRbT96zVPopuzM6I86KV3In21FUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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