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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04cb9c990989d6a0de32c534ae8adf6af2cab02b1f208a9de4ec395bce1118c' 
  AND token = 'whz+zQHTEQaSMUL1zaviJsP58RmtqKZz+E+dnx37+Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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