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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7693f1c571e42fa9a48126441c581d4bbb0080116cae6c1b01a5e665b4b3e6c7' 
  AND token = 'OPwq8vTOIwCvGh1OLJChArcT1mNSN25iv7Ed6HjXLnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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