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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a179f56c06566dfeecf721c205f3db188199f5b6ec04572213708449642746' 
  AND token = 'QY0AbqbVY1qVf2dWT5ppgIWDY7IuvL9u9P+IfsgIk4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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