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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a23fd9fa3977eab4f34f8fb9a6270b23c8da588883c785c0b74de8c55f06343' 
  AND token = 'rxaSb40V7mIAapv56HuTJ8o4gOrGX2Relqztbk+hzt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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