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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7029b316903fb586295846c32bb9cea10eff58c9d14ad449ca1dbfc738b221c8' 
  AND token = 'vlKc8U8pMgiXdm5g4sKwb2yK/KmRH9R3XaLu+PukNtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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