SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0d49def479c6bc4770763f2275d5bc3c5f405612a7d3ae0ec89a9e7b686f9d' 
  AND token = 'CvfDVZzwLH+d0VCDSn8iG+ZmCp8ii6OJl/+stC9UxQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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