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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b620cd8c98d8b038238356d891891a8a318259df74f356114d77dc5c0fb5ab63' 
  AND token = 'ErnX3OQ3e58yUZIOlOW/+NbqI0Uu6z0e41J87YSK+7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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