SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda015163eb15f9cb84534e6eab3e8649a1457b848af99712bcb7d9494d96943' 
  AND token = 'G8QFSas74HNFeidb/gXMVoaA6ZCFBvAGvjzYJ/mRl4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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