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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1508486f640c357c41b35b11bc97b457dc0cfa7dbbf59eeacccb7bcbee95a219' 
  AND token = 'z9HYqDsNM8SUA58oLY6Xlh8fxzdjQvYW2qVRaw8rJ60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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