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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6735fdb0e36a4b05f99cfa6330bd829ce545cdd9c3bc0bbdababbb2ae252ac' 
  AND token = 'eMoWsVpNOxBjHxdwrbN2FG+bthLJ71B2QTDecgGcHoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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