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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c05634be13560a95a563d8fe3662469e90fe7d132be5bf4bd101aaae7f09dea' 
  AND token = 'UiDe+n4dO1vcc//oGJ0WdX9MZddTTGM655iqr+tky0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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