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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a46347edb5d58b8ce1d260716df8fb0ea877143a03b8198f8630d55e0861de56' 
  AND token = 'FOS7DzPDaVDApEDAlX+w1y1ZBAB12ZzrO9ycoSr629A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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