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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e64a5cd9c6456864de79625b73b033a24d8097794f7255bac33a35f4ef5afd' 
  AND token = '3rfs6Gq3iAouaJKBMqKTkk3NjKMduLH0vjmgmmQ72zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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